<!DOCTYPE html>
<html>
<head>
	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
	<title>零宽字符</title>
	<style type="text/css">
	* {
		padding: 0;
		margin: 0;
	}
    </style>
</head>
<body>
	<div class="container">
		<h1>零宽字符</h1>
	</div>
	<script src="https://cdn.staticfile.org/jquery/3.2.0/jquery.js"></script>
	<script type="text/javascript">
	const foo = "abc\u200bdef";
	const bar = "\u{200b}abc\u{200b}def";
	console.log(foo.length, foo); // 7
	console.log(bar.length, bar); // 7

	</script>
</body>
</html>